ZFSBuild2012 – Friday Afternoon Action Shot
We are still running benchmarks. We decided to share a Friday afternoon action shot of the server mounted in the rack.
5 Comments to ZFSBuild2012 – Friday Afternoon Action Shot
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Thank you so much for this site/blog it has been very helpful.
I still don’t quite understand the function of a ZIL device(s). Is it basically a write cache? (I understand that the term cache device is used for storage of commonly read data, but I didn’t know another way of asking).
I’m going to be building a storage server that needs to be able to write 6-10x 5-8GB files at once, each hour, for 3-4 hours. I’ll be using 7200 SATA drives and would love to use RAIDZ but I’m worried if I’m writing all those large files at once that there will be a lot of seeking that will degrade my performance…
Any insight would be much appreciated.
The ZIL is for synchronous writes. It is essentially a write cache, but only for a certain type of write.
Depending upon the workload, if the files are streaming writes, and you are not doing much (if any) reading, a 7200RPM RAIDZ setup would probably work ok. If it’s a random write pattern and you are doing any reading, you’re going to probably want to look at Mirrored/Striped configuration at a minimum, possibly moving up to faster disks.
I have OpenIndiana installed on my NAS and I have an NFS client writing some logs to the OpenIndiana storage server.
If I do a tail -f from the Linux NFS client doing the writing to one of the logs files on the OI NAS, it works fine. If I stop that and do it (tail -f) *from* OI itself, it does not update every second. It just sits there. If I then leave that tail going then go back to the Linux machine and run the tail, then both work and I start getting output consistently from OI itself like expected. Soon as I stop the tail on the Linux machine, the OI tail also stops.
Why is it behaving like this?
It seems that the tail -f from OI itself updates every 30 seconds.
(Unless of course I also fire up a tail from the NFS client itself then it updates every 1 second).
Hello,
Thank you for a very interesting blog.
Could you please advise best ZFS configuration for such hardware:
Chassis – Supermicro 24×3.5 SAS\SATA
Storage Disks – 24x SAS 15k 600Gb
System Disks -2xSAS10k 300Gb
RAM 32 Gb
OS – Nexentastor
I’m thinking about two possible configurations
First – 5xRAID10, 4xHDD for a hotspares
Second – 10xmirror, 2xHDD for a hotspares.
How do you think which configuration will be more good for huge load?
This storage will be used for virtualization (large testlab, about 70 VM’s)